Stress and Deformation Faults Scidiv Bellevuecollege

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an ambition in structural geology is to try and deduce the stress regime under which specific structures developed there's also questions that we might want to ask are what conditions could faults slip under can we deduce the regional stress regime under which thoughts developed in regards to specific questions such as why are normal fault sleep and thrust falls gently dipping we can pose the problem is normal faulting easier than thrusting and are there particular ways in which the conditions in the earth might promote faulting the tool we're going to use for this is something called the more circle it's a graphical display developed by the german engineer otto moore at the end of the 19th century so let's think a little bit about stress in the earth so let's imagine a column of rock and a cube of rock at the bottom of it the stress is acting on this unit cube primarily coming from the vertical load of rocks on top and you might expect those rocks at the bottom to squeeze out sideways